/*
 * @Author: Clark
 * @Email: haixuanwoTxh@gmail.com
 * @Date: 2023-01-18 13:13:33
 * @LastEditors: Clark
 * @LastEditTime: 2023-01-18 13:31:05
 * @Description: file content
 */

#include "apue.h"
#include <pthread.h>

struct foo{
    int a;
    int b;
    int c;
    int d;
};

void printfoo(const char *s, const struct foo *fp)
{
    printf("%s", s);
    printf(" structure at 0x%lx\n", (unsigned long)fp);
    printf(" foo.a = %d\n", fp->a);
    printf(" foo.b = %d\n", fp->b);
    printf(" foo.c = %d\n", fp->c);
    printf(" foo.d = %d\n", fp->d);
}

void *thr_fn1(void *arg)
{
    struct foo foo = {1, 2, 3, 4};
    printfoo("thread 1:\n", &foo);
    pthread_exit((void *)&foo);
}

void *thr_fn2(void *arg)
{
    printf("thread 2: ID is %lu\n", (unsigned long)pthread_self());
    pthread_exit((void *)0);
}

int main(void)
{
    int     err;
    pthread_t    tid1, tid2;
    struct foo  *fp;

    err = pthread_create(&tid1, NULL, thr_fn1, NULL);
    if (0 != err)
    {
        err_exit(err, "can't create thread 1");
    }

    err = pthread_join(tid1, (void *)&fp);
    if (0 != err)
    {
        err_exit(err, "can't join with thread 1");
    }

    sleep(1);
    printf("parent starting second thread\n");
    err = pthread_create(&tid2, NULL, thr_fn2, NULL);
    if (0 != err)
    {
        err_exit(err, "can't create thread 1");
    }

    sleep(1);
    printfoo("parent:\n", fp);
    exit(0);
}
